our science teacher helped us build it. ♪ now i'm a geologist at chevron, and i get to help science teachers. it has four servo motors and a wireless microcontroller. over the last three years we've put nearly 100 million dollars into american education. that's thousands of kids learning to love science. ♪ isn't that cool? and that's pretty cool. ♪ ♪ >>> that's psy's gangnam style. it turned him into an overnight sensation here in the u.s. guess what. he's back home now in south korea. and as you can see, his fans loved him there. we're going to hear from psy about his triumphant home coming in a little while. >> why not. why do you think we do these stories? there's only one reason. >> to embarrass me. >> well, to embarrass ourselves and to get you to do the gangnam style. >> no. >> we need a hash tag, matt does the gangnam style today. >> you hold your breath and we'll see what happens. >> in the meantime, we'll move on. >>> we're going to meet a couple who cannot stop saying i do. they have held ceremonies in 24 different spots around the world leaving their old lives behind in the